Pop-up sprinkler



FIG. 1 is a top perspective view of a pop-up sprinkler showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is another side elevational view thereof showing the sprinkler head in a raised position;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a pop-up sprinkler, as shown or described. 